Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5d8045bcee4349…

MALICIOUS

PDF

105.9 KB Created: 2021-08-09 15:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 91c8b5890f28350d0d8499a200449717 SHA-1: d7f9a19b01d99fd727363503e7bcb7f71cf025b5 SHA-256: de5d8045bcee43496fa02a12d47eaf3722411c0f4f540de31862e8f916e067ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, suggesting it's designed to distribute further malware or lead users to phishing sites. The presence of numerous links on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/7uruu7kenfei4l4m1v5p7651oo/77383499487.pdf In PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161046ab66d7f5---zawolowepu.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3f962bcb8---27526179660.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f25a9513b---5895871179.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608155a5873a2---18328378207.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ae2a3c0e1703bd322d11b3748f0a057c/repovona.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/xizuz.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/36372352372.pdfIn PDF document text
    • http://gpn1971.org/clients/a/a2/a25689677492d603657f1241a2a69ea8/File/luxide.pdfIn PDF document text
    • https://digireg.org/upload/fekijovapewopuzanofu.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608692ca00644---85048501271.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/qi9kp97ck1rif7i929j38gmeii/gosolapapolizetuvejuwote.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078abbdb4e94---7425298359.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/j9ruef2b2v9toej8j16od9l9tb/4438249271.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/kabatedepinu.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/4e1682dd9ee654d72d8dc525ff3f1abe/45649530688.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e2f5fca702625bcde54b7c67efff445a/puveguwazififegamonalolod.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/sazavufuwo.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/q0urf9aebkh5hn6h952dhdcaes/vufagabam.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/movubomipinutika.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/ranib.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/jobutokosepirukiwu.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53f1f414a4---17181103024.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210707002646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cartoon+cat+3d+model+creepypastaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001323e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323E 10900 bytes
SHA-256: 039822f9b6017c8988ff60a3a18d2801a8d83aefccce78edc6a7421050155727
font_01_sfnt_off00014b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000163a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163A0 20500 bytes
SHA-256: c7531febc98de3278d4997e5b66bceeb542f2b8c17e134260784046160d196c9